| Primary satellite | Secondary satellite |
| Name | Cosmos 2181 Rocket | COSMOS 627 DEB |
| Spacetrack catalog number | 21903 | 45504 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 15 20:38 | 2021 Apr 16 03:35 |
| Time of closest approach (UTC) | 2021 Mar 05 19:02:55.549 |
| Minimum distance | 2.102 km |
| Height difference | -1.867 km |
| Relative speed | 14.226 km/s |
| Angle between velocity vectors | 152° |
| Geographic position | 59.9°N, 179.2°W |
| Height | 1022 km |
|